Abstract : SAIC, in association with O'Neill Development Company, completed a proof-of-concept study of a unique engine-generator system that uses opposed cylinders to drive a common piston linearly back and forth through a solenoid. We found that the basic concept of the "lineal generator' is viable. It offers a number of advantages: its relatively simple design will result in improved mechanical robustness and cost savings, and it is easily customized to specific applications. There are a number of challenges that must be addressed: for example, the lack of rotational components makes starting the device mechanically difficult, structural alignment is critical, and balanced engine and load parameters are crucial. Though the levels of complexity are different, each can be successfully addressed through careful component design and engineering. Because this technology offers such promise, SAIC is continuing development of the device for commercial applications.